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EMBRYOLOGICAL PROCESSES DURING the SEED FORMATION in TWO TRIPLOID SPECIES of Taraxacum

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EMBRYOLOGICAL PROCESSES DURING the SEED FORMATION in TWO TRIPLOID SPECIES of Taraxacum ISSN 1644-0625 ISSN 2300-8504 (online) www.agricultura.acta.utp.edu.pl Acta Sci. Pol. Agricultura, 14(2) 2015, 29-36 EMBRYOLOGICAL PROCESSES DURING THE SEED FORMATION IN TWO TRIPLOID SPECIES OF Taraxacum Agnieszka Janas, Krystyna Musiał, Maria Kościńska-Pająk1 Jagiellonian University in Kraków Abstract. The present paper reports on our observations on embryological processes occurring in the ovules of triploids: Taraxacum belorussicum (sect. Palustria) and T. atricapillum (sect. Borea). The reproduction of these dandelions comprises meiotic diplospory, parthenogenesis and autonomous endosperm development. Mature seeds contain viable embryos that provide regular seedlings. At present the importance of cytological and embryological studies of apomicts is specially emphasized because Taraxacum is one of the model genus for investigations of apomixis. It forms a polyploid complex within which there is a close relationship between the mode of reproduction and the ploidy level: diploids reproduce sexually, whereas polyploids are apomicts. Apomixis is of a great interest in plant breeding because it allows clonal seed production but asexual seeds formation by apomixis is not found in any crop plants. Unfortunately, to date any attempts at introducing of apomixis into crop species have failed. It is worth mentioning that dandelions are valuable honey plants and numerous species of Taraxacum are also used in modern herbal medicine. Key words: agamic complex, apomixis, dandelion, diplospory, female gametophyte, Nomarski contrast INTRODUCTION The Taraxacum Wigg. genus belongs to the family Asteraceae, the subfamily Cichorioideae, the tribe Cichorieae and the subtribe Crepidinae [Anderberg et al. 2007]. This cosmopolitan genus forms a polyploid complex comprising amphimictic and apomictic taxa. Diploid dandelions reproduce sexually whereas seed formation in polyploid species is realized by gametophytic apomixis, parthenogenesis and autonomous endosperm development [Musiał et al. 2013a and references therein]. Common co-occurence of apomixis and sexual reproduction is one of the reason that cause the large taxonomic complexity of Taraxacum [Kirschner et al. 2003, Záveská Corresponding author: dr Krystyna Musiał, Department of Plant Cytology and Embryology of Jagiellonian University in Kraków, Gronostajowa 9, 30-387 Cracow, e-mail: [email protected] © Copyright by Wydawnictwa Uczelniane Uniwersytetu Technologiczno-Przyrodniczego w Bydgoszczy, Bydgoszcz 2015 30 A. Janas, K. Musiał, M. Kościńska-Pająk Drábkowá et al. 2009]. The genus Taraxacum is divided into 60 sections comprising about 2800 species [Kirschner et al. 2014]. The Polish dandelion flora is dominated by triploid and tetraploid taxa and is represented by 374 species classified (depending on the classification system) into 12 or 13 sections [Marciniuk et al. 2010a, 2012]. Most species belong to the section Ruderalia (292), well-represented are also sect. Erythrosperma (24), sect. Palustria (22) and sect. Hamata (11) whereas sections Celtica, Borea, Piesis, Fontana, Alpestria, Alpina, Naevosa, Erythrocarpa comprise a single dandelion species [Marciniuk et al. 2010a, 2012, Marciniuk 2012]. Taraxacum is a very common perennial associated with grassland communities but it is also often found in lawns, roadsides and roadside streets [Sudnik-Wójcikowska 2011]. Although the dandelion is considered to be a burdensome weed, it is also used in many traditional and modern herbal medical systems due to the content of components demonstrating, among others, anti-inflammatory, anti-oxidative and anti-carcinogenic activities [Choi et al. 2002, Hu and Kitts 2003, Yarnell and Abascal 2009, Mahesh et al. 2010, Michalska et al. 2010]. Moreover, dandelion species are valuable honey plants [Weryszko-Chmielewska and Chwil 2006]. Furthermore, it is worth mentioning that Taraxacum is a model taxon for the investigation of molecular and genetic background of apomictic processes [Tucker and Koltunow 2009, Barcaccia and Albertini 2013]. Apomixis is of a great interest in plant breeding because this mode of reproduction leads to the formation of populations that are genetically uniform maternal clones and the introduction of apomixis into agriculturally important sexual genotypes could allow for the fixation of heterozygosity and hybrid vigour which may result in tremendous benefits to agriculture and seed production [Barcaccia and Albertini 2013 and reference therein]. Therefore at present, despite the advanced research at the molecular level, the importance of cytological and embryological studies of apomicts is emphasized. The present paper document megasporogenesis and female gametophyte formation in Taraxacum belorussicum Val. N. Tikhom. (sect. Palustria) as well as seed formation in T. atricapillum Sonck (sect. Borea). Previous caryological analysis showed that these species have a triploid number of chromosomes (2n = 3x = 24) [Marciniuk et al. 2010b, Musiał et al. 2015]. Those two species are poorly known, moreover, T. belorussicum is one of the endangered taxa because of human activity. Therefore the knowledge of reproductive biology is fundamental for an effective protection of this species. MATERIAL AND METHODS Mature seeds of Taraxacum belorussicum and T. atricapillum were sampled from plants within a natural population, respectively in Mścichy (53º25' N; 22º29' E) and in Żabokliki (52º11' N; 22º19' E) by dr. Jolanta Marciniuk. Then, plants obtained from seeds of T. belorussicum were cultivated in an experimental field. From the cultured specimens, whole inflorescences at various developmental stages were collected and fixed in acetic acid: 96% ethanol (1:3, v/v) for at least 24 h. Fixed plant material was stored in 70% ethanol. Then, isolated individual flowers, ovaries or ovules were cleared in methyl salicylate according to a procedure described by Mól [1988] and Musiał et al. [2012, 2013b]. Samples were dehydrated in a graded ethanol series and then infiltrated with methyl salicylate. Cleared samples mounted on a Raj slide in a drop of clearing fluid [Herr 2000] were examined with Nomarski interference contrast (DIC optics). Acta Sci. Pol. Embryological processes... 31 Embryos of T. atricapillum were isolated from mature seeds and tetrazolium test was used to estimate embryo viability [Siuta et al. 2005]. RESULTS AND DISCUSSION The seed is one of the fundamental factors of crop productivity. Therefore, knowledge of the essential mechanisms of seed formation is crucial for the progress of agricultural production. Among flowering plants there are two pathways of reproduction through seeds. Most angiosperms produce genetically variable seeds by a fusion of meiotically reduced egg cells and sperm cells. However, some flowering plants have evolved an alternate form of reproduction termed apomixis, often referred to as agamospermy. The apomictic mode of reproduction omits crucial processes occurring in the sexual pathway and apomictic plants produce progeny that is an exact genetic replica of the mother plant. Meiotic reduction is bypassed prior to female gametophyte formation (apomeiosis), the egg cell forms an embryo autonomously (parthenogenesis) and endosperm development is autonomous or may require central cell fertilization (pseudogamy) [Nogler 1984, Asker and Jerling 1992]. As apomictic offspring carries the full genetic maternal constitution, apomixis is a highly desirable trait in plant breeding and seed production. Both in sexual and apomictic mode of reproduction the same generative structures are involved in the developmental trace. Flowers of the investigated triploid Taraxacum belorussicum possess an inferior, unilocular ovary containing one basal, anatropous, tenuinucellate and unitegmic ovule (Fig. 1a, b). Similar structure of ovary and ovule is typical for the members of the Asteraceae family [Johri et al. 1992] and has been also described in other dandelion species [Musiał et al. 2013a, b, Musiał and Kościńska-Pająk 2013b]. In young ovules of T. belorussicum, a single hypodermal archesporial cell differentiates and develops directly into a megaspore mother cell (MMC) which elongates in the micropylar- chalazal axis before the beginning of meiotic division (Fig. 1c). Then MMC enters into the first meiotic prophase (Fig. 1c, d) but because of asynapsis there is a strongly reduced chromosome pairing. The univalents remain scattered over the whole spindle of metaphase I and the restitution nucleus is formed after the first meiotic division, instead of two reduced nuclei. The second meiotic division proceeds without disturbances and leads to the formation of two unreduced megaspores i.e. diplodyad (Fig. 1e, f). Such irregular meiosis is distinctive for meiotic diplospory which was observed previously [Janas et al. 2014]. It was also found in other poliploid taxa of Taraxacum as well as in species of Chondrilla, Erigeron, and Ixeris [Nogler 1984 and references therein, Kościńska-Pająk 2006, Kościńska-Pająk and Bednara 2006, Musiał et al. 2013a]. On the other hand, a regular course of meiosis was documented in the recent embryological examination of a diploid dandelion Taraxacum linearisquameum [Musiał et al. 2015]. It should also be emphasized that in the analysed ovules of T. belorussicum an early formation of integumentary tapetum was observed (Fig. 1f-h). Such a process was also reported in some other examined diplosporous apomicts [Kościńska-Pająk 2006, Musiał et al. 2013a, 2015]. It seems that it may be associated with the later autonomous embryo and endosperm development.
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